This appears to be required on Windows 7, or perhaps depends on the video
driver.

If GetFrame fails, bitmapframe was not created and should not be released.

If the format is not supported, D3DXGetImageInfoFromFileInMemory will fail.

winex11.drv: Set last error to ERROR_BUSY when attempting to delete a cross-thread context in wglDeleteContext.

msvcrt: For internal msvcrt use, added ability to grow automatically the size of the buffer in printf core engine.

This is needed to keep track of the embedded window position by
handling ConfigureNotify received by ancestors.

Specifically, the Gallium r600 driver reports "X.Org" for vendor and a string
of the form "Gallium 0.4 on AMD RV730" for the renderer.

The floating point formats from ARB_texture_rg are only defined when
ARB_texture_float is also supported. It would have been nice if the formats
table itself was able to express this, but as far as I'm aware this is only an
issue for ARB_texture_rg, so it's probably not worth changing.